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TO ALL WHOM Il MAY CQNCERN v Beit known that I, GEORGE C. TAFT, of Worcester, in the county of Worcester, andstat'e of Massachusetts, have invented anew and usefnllniprovementin Wrenches and I dolhereb'y declare 'that th following is a full, clear, and exact description thereof, which will enable others 'skilled in. the art to ina-lie .and use the same, -reference being had to the accompanying drawings, forming part of this specification, inwhich-- Figure 1 is a side view of my improved wrench when; closed. I

Figure 2 is asimilar view ,when open, and partly insection.

' `Figure 3 is an end view.

Similar letters ofl reference indicate like parts. i

This invention relates to improvements in Vthe construction of screw-wrenches, commonly called lmonkeywrenches, and consists mainly in forming the main bar in a separate piece, `which passes looselyfthrough the head' or fupper jaw ofthe wrench, instead of Atheir .being forged togetherjin one piece as; usual, and in' connec-` tion therewith, a right and left-handed screw on the rosset, for openingand closing the two sliding jaws.

-By the construction of Vmy improved wrench with an independent sliding main bar, VI dispensewith the .expensiveforge-work now required in the manufacture of wrenches of this kind, andam enabled t`o make them Y much cheaper, while additional strength is secured by the connection of the rosset with the head-jaw.

A is the main'bar of the wrench, the rear end of which is xed in the fel-rule a, onthe handle B. C is thehead or upper jaw, and D the lower jaw.- Both jaws are movable on the'main bar A, `whichpasses through them, as shown in the drawings.

Right and left-handed screwsare cut upon rthe osset.E,-the screw m onithle end being fitted to work freely in a corresponding female screw in fthe back' part of the jaw C, and the screw n on the bodyofthe rosset, largeriu size, and usually made with a left-handed thread, being fitted to work5freely in a corresponding female screw in the back part o f the jaw D. f

The rosset E'is pivbted at its rear end to turn freely'in a projection, on fthe-ferrule a, and the -milled thumb-wheel c on the rosset E is partly Asunkin a shouldered recess, d, ma`de in the side of the main bar A, for 'the purpose of holding the rosset and the jaws CI'D on the main bar'A. i 1` p The wrench is operated by turning the rosset with the milled thumb-wheel c in-theordinary manner. j What VIelaim as new, and desire to secure by Letters Patent, isl i p YThe slidingjaws C and D, held on the bar A, by means Vof- 'the rossetp fitted in the recess d of bar A, all reonsrtructed and arranged to operate substantially as described. A l I The above specieaton .of my invention signed by me, this 4th day of December, 1866.

eEo., o. nur.

Witnesses:

JAMES H. BANcnorT, W. A. WILLIAMS. 

